Heel portion of a shoe



FIG. 1 is a rear perspective view of a heel portion of a shoe showing my new design;

FIG. 2 is a rear view thereof; and,

FIG. 3 is a side view thereof.

The uneven broken lines immediately adjacent to the bottom shaded area represents an unclaimed boundary of the design. The broken line showing of the generally triangular shape within the claim area and of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a heel portion of a shoe, as shown and described. 